When you don't have a lot of storage space, your best bet is to build
up. You can purchase steel and plastic shelves from your home
improvement store, but the steel shelves are expensive and heavy and the
plastic shelves can sag and fall apart. Take some time to build your
own shelves from wood and you'll have a fully customizable and solid
storage solution.
Home Depot, Lowe's and your local lumber yard have everything you need
to build your own storage shelves. Heck, you may even have enough
materials in your scrap lumber pile to build a storage rack.
All you need are a few 2x4s, OSB (or plywood), and 2" deck screws. This
particular shelving unit has four levels and is supported by six 2x4s. A
drill/driver, level, and measuring tape are required to assemble the
unit. This video shows the use of tote boxes and a 2x4 to help hold each
new shelf in place as it's being attached.
Watch the video above for the full cut list and assembly instructions.
How to Build Cheap Shelves Garage Storage | FloppyHatPhotos (YouTube)